Exactly how life arose out of non-living matter is a major mystery, and a new study has found that natural selection may have played a role before life itself even existed on Earth. By recreating the ...

The key to understanding how the most aggressive lymphomas arise and resist current therapies may lie in mutations that disrupt a critical natural selection process among antibody-producing B cells, ...

The Indigenous peoples of the Bolivian highlands are survivors. For thousands of years they have lived at altitudes of more than two miles, where oxygen is about 35 percent lower than at sea level.